reduces number of iterations when recovering Merkle shreds #16385

Job	Run time
cargo-test-sbf (associated-token-account)	7m 49s
cargo-test-sbf (feature-proposal)	7m 8s
cargo-test-sbf (instruction-padding)	6m 43s
test_cli (single-pool)	19m 16s
check (associated-token-account)	1m 31s
cargo-test-sbf (memo)	6m 22s
check (feature-proposal)	2m 20s
cargo-test-sbf (record)	6m 49s
test_cli (token-2022)	19m 1s
check (instruction-padding)	52s
cargo-test-sbf (single-pool)	8m 12s
check (memo)	1m 23s
cargo-test-sbf (slashing)	15m 44s
check (record)	58s
cargo-test-sbf (stake-pool)	10m 56s
check (single-pool)	3m 15s
cargo-test-sbf (token-2022)	8m 29s
check (slashing)	3m 21s
check (stake-pool)	2m 11s
check (token-2022)	2m 49s
	2h 15m 9s

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